Lamp socket



March 18, 1930. s, OSTERMAN 1,750,965

- LAMP ,SOCKET Filed April 20, 1929 I NVENTOR ,i almuzl Q1 ATTORNEY Fatent ecl Mar. 18, 1930 SAMUEL OSTEBMAN, OF BRONX, NEW.YOBK

LAM]? SOCKET Application filed April 20, 1929. Serial No. 356,823.

My invention relates to lamp sockets and a method of preparing the same.

More particularly stated I seek to improve lamp sockets of the kind used for holding incandescent lamps, my purpose being to fix the sheet metal screw shell of the socket more firmly in position, and to center it accurately. In this connection it may be noted that a lamp socket of the general type here contemplated comprises a cup-like socket made of insulating material, and a metallic screw shell housed within said socket; and that difficulty has heretofore been experienced in centering the metallic screw shell relatively to the socket, and in holding said screw shell firmly in place within the socket.

By my invention I seek not only to center the screw shell within the socket but also to give it a firm anchorage therein.

I also seek to improve the structure of the lamp socket, for the purpose of increasing the efliciency thereof.

Reference is made 'to the drawing forming a partof this specification. and in which like reference characters indicate like parts throughout the several figures.

Figure 1 is a substantially central vertical section through my improved lamp socket,

and is taken upon the line 11 of Figure 3, looking in the direction indicated by the arrows.

Figure 2 is a substantially central vertical section through the lamp socket. before its completion, and shows a plunger and a formsocket.

Figure 3 is a plan view of thelamp socket shown in Figure 1. w

Figure 4 is a side elevation of the sheet metal screw shell.

Figure 5 is an end elevation of the plunger used forsecuring in position the sheet metal screw shell.

The body portion of my improved lamp socket is shown at 6, and is made of insulating material, preferably of a kind which can be softened by the gentle application of heat. There are any number of such insulating'ma 5o terials in general use, among them being vaing die as used in the manufacture of the lamp rious compositions commonly known as rubber compositions.

The socket 6 is provided with an opening 7 and with a-bottom 8 bounding this openirfig, tle socket being thus substantially cups ape The socket is provided internally with a number of grooves 9, 9, 9,9, disposed substantially parallel with each other and with the general longitudinal axis .of the shell.

Located within the socket 6'is a lining 10, made of sheet metal and corrugated spirally as shown, being thereby threaded.

The screw shell 10 is provided with a single slot 11 extending-longitudinally of its axis. This enables the screw shell to be compressed slightly, and thus readily sprung into the socket 6.

The screw shell 10. is provided with spacing leaves 12, in thisinstance four in number. The screw shell is further provided with two smaller spacing leaves 13, 13, located upon opposite sides of the slot 11.

The screw shell 10 is provided with a number of anchor points 14, equal to the number of the grooves 9. In the particular instance here shown there are four anchor points 14, and four grooves 9.

Vires 15 and 16 are used in connection with the screw shell 10. The wire 15 leads to the mner contact button 17, and the wire 16 is connected at the point 18with the body portion of the screw shell 10.

The socket 6 is provided with holes 19 and 20, through which these wires are threaded.

Referring to Figure 2 a forming die appears at- 21, and has the proximate form of a massive cup, provided with holes 22 and 23.. The socket 6 fits detachably into the formmg d1e 21, the wires 15 and 16 extending downwardly through the holes 22 and 23.

A plunger, co-acting with the forming die 21 and movable relatively thereto, is shown at 24. The plunger is provided with a smooth cylindrical portion 25, and with an annular 95 flange 26.

The flange 26 carries a number of preserfingers 27, equal to the number of grooves 9 ofthe socket 6, or to the number of anchor pomts 14 of the screw shell 10. In the par- Em ticylar instance here illustrated there are four ofthese presser fingers 27. Housed thin the plunger 24, and partialv ly encircled by the annular flange 26, is aheat- 5 ing coil 28. The purpose of this heating coil is to heat the plunger, and particularly the annular flange 26 thereof.

a J In assembling thelamp .socket, the screw" shell 'of sheet metal is compressed. slightly,

" 10 so that the slotll is narrowed a little, and the down. The heatin coil 28 kee s the plunger hot, and because 0 this fact t e screw shell 10is also heated. This is particularly the case with the upper portion 0 the screw shell,

including the annular flange 26.

The anchor points 14,- being heated and also presed downwardly and outwardly by the resser tinge rs 27, are forced radially outward and 'ven slightly into the'socket. 6,

as may be understood from Figures 1 and 2.

theg'se'rew shell 10 is anchored firmly within thefsocket 6. Each anchor point 29 now acts'as a barb, and the anchor points thus prevent any retro ade movement of the screw shell 10, and hold the same firmly with- 5 in the socket 6.

Figure 2 shows the anchor points 14 as simply resting against the adjacent bottoms of the grooves 9, and ready to be thrust into the. wall of the socket. Wh the plunger de- 40 scends atrifie, the anchor points 14 are partially embedded within the material of the socket, as indicated in Fi -1. Next the plunger is withdrawn, an the lamp socket, now finished, is removed from the forming die.' j

I do not limit myself to the precise appaw .barbs. I Signed at New York cigfin the-county of mg a lamp socketi which consists in provid-- m so ed by heat, placing within said socket a metallic screw s ell provided with anchor points, and applying lieat'and pressure "to said screw shell in order to force said anchor points into the substance of said" socket.

a hollow socket of'material adapted to be 3. The combination, of a hollow socket made of insulating material and provided in ternally with grooves, and a screw shell made of sheet metal and located within said socket, said-screw shell being provided with andisposed withinsaidsocket and threaded internally, said screw shell being Provided with anchor points having portions orced into the substance of said socket and serving as barbs said socket.

rial and a threaded shell made of sheet metal and located within said sacket, said shell hav for holding said screw-shell in place I 5.- A lamp socket, comprising a substam' tially cup-shaped socket of insulating mate- A ing anchor points forcedinto' the substance.

of said socket and se said screw shell within said shell.

6. A lam socket, comprising tially cupaped socketof as barbs to hold f a'subsln ating material and a threaded shll'made of sheet metal and located within said socket, said shell being provided with portions forced outwardly into the substance of said shell,;and serving as New York and-State of ew York this 8th day of April, 1929.

' e V OSTERMAN.

ratus and method here illustratedand de- .scribed,as variations therein may made without departing from my invention, the

scope of invention being mclalms thus described my invention, what I claim as new and desire to secure by-Let-' ters Patent is as follows like member of material adap 1. A lamp socket, comprisingla hollow cu to be softened by heat, said cup-like-member I I being provided internally with-grooves, and

a screw shell located said'cup-like a, @Q -member. and provided with anchor points 'ext ves, said screws-shell P er provided with a slot for enab saldscrew shell to :be sprung into said cupe member.

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